Lea told Seventeen exclusively, "I have not talked about 'If You Say So' yet. It's about my last conversation that I had with him. I spoke to a woman who lost her son, and she mentioned how grateful she was that the last words she said to her son before he died were, 'I love you.' Mine were that as well. [The song] is just about that. There are lots of different emotions—if you could see this person again, what are the things you would want to say to them? It's a personal story."

The new song off her upcoming album Louder (which debuts March 4) was finally revealed online, and the lyrics will completely break your heart. Check them out—then listen to the full song below:

Was just a week agoYou said I love you girlI said I love you moreAnd a breath, a pause, you said, if you say soIf you say soIf you say so

It's been seven whole days, seven whole daysSince I heard the phone ringSeven whole days, seven whole daysSince I heard your voiceAnd I can't get the last words that you saidCan't get those words out of my headIt's been seven whole days, seven whole days of pure hurtAnd I can't get away from the burning pain a light you wakeAnd the fallen hero haunts my thoughtsHow could you leave me this way